By mable h



Dec. 3, 1929.

Original F iled Jan. 6. 1926 I ,2; ll 77 2? 7 78 24- I 10! Q 4 y h n, I146' .r U I ll 42 44 33' INVENTORS I AND CLYDECLF'ARMER I THOMAS H.THoMAs (n :c n) ABLE M.THoMAs,ExecuTR|x ATTORNEY saunas, 1929 um'rsnsTA'rEs PATENT OFFICE OLYDI O. I'll-m, OI PITTSBURGH, AND THO! H.rnonas, IDGIWOOD, rnmmvaxu, BY man I. 'I'HOIAB, 11161715311, IDGIIOOII),

rmmvam, ASSIGNOBB TO THE WESTINGHOUSE m BRAKE OI Orlglaal I0. 1,671,dated 88, 1m, Serial No. 73,548,

ramvsnva'na mun an. Application for reissue fled September 12, 1029.Serial Io. 898,814.

7 This invention relates to fluid pressure brakes, and more particularlyto a valve device for controlling and maintaining the pressure in thebrake cylinder. One object of the invention is to provide means formaintaining the pressure in the.

brake cylinder and for controllin the graduated release of the brakes,in whic the maintaining means are controlled by variations in. auxiliaryreservoir pressure, so that release of fluid from'the brake cylinder ingraduating the release of the brakes will be more nearly roportional tothe rate of increase in a ary reservoir pressure. Another object is toprevent the brake cylinder pressure maintaining means from func- 28tioning when the apparatus is set for direct release, except uponmovement of the triple valve device to application position.

Other objects and advanta will appear more details description of in thefollowing the invention.

In the accompanying drawing; Figure 1 is a diagrammatic sectional viewof a brake cyla inder (pressure controlling and maintaining valve eviceembod the invention; Fi 2 a view of the ac l a tid release controllinortion set at e direct release position; an ig. 3 a view of thechange-over cap-in poso sition for supplying auxiliary reservoirpressure instead of maintaining reservoir pressure to the emergencyreservoir charging device. 7 v

Accor to the invention, the apparatus may comprise a triple valveportion, a brake cyhnder pressure maintaining and control portion, acheck valve portion, and a gradnated release control portion.

The triple valve portion comprises a piston 3 contained in pistonchamber 4, a main slide valve 6 and a graduat' slide valve 6 containedin valve chamber and adapted to be operated by piston 3. The triplevalve device is 1'0. retard release of thebrakes including a member 8adapted to engage ieldug' sto he sli e val e-fi and subject to thepressure P ofacoilspring9.

The brake cylinder pressure. maintaining and control portion comprises aslide valve ed with means for securing av 10 contained in valve chamber11 and adapted to be operated b variations in fluid under pressure ondis ragm heads 12, 13, and 14 havin leak tig t connection toflexiblebellows aphragms 15, 16, and 17. The chamber 18 at theleft ofdiaphragm head 12 is 1), Lara ma ru 0, ma. lane-ed Ieveiber a,

connected through passage 19 with an emergene reservoir 20. The chamber21 inclofl y t e diaphragms 15 and 16 is open to the atmospherethrouglian exhaust rt22. The valve chamber 11 is connected pm age 23 andpipe 24 to the brake hnder 25 and chamber 26 at the right of head 17 isconnected through i w: 27 with valve chamber 7 and the auxiliaryreservoir A coil spring 29 acts on the diaphra head 14 and tends to movesame to the i t and upon a predetermined movement of said head towardthe right, a stop member 30 is engaged, the movement of which is opposedby a spring 31. V

The check valve portion comprises a piston 32 contained in a pistonchamber 33 and a slide valve 34 contained in valve chamber 35 gridadapted to be operated by piston 32.

e thro h passa 36 with valve chamber 35. A ma i ntaming seservoir 37 isconnected to a p w 38.1eading to the seat of slide valve 34 an theemergency reservoir 20 is connected through passage 19 with a 39leadauxiliary reservoir 28 is connected inglto the seat of slide valve34, so that when sli e valve 34 is moved to the left, the emergencyreservoir 20 and the reservo r 37 areconnected to the auxiliaryreservoir 28.

The check valve portion also includes aslide valve '40 contained invaIvechamber 41 and adapted to be operated by a head 42 which isconnected to .a flexible bellows diaphragm 43. The valve chamber 41 isconnected through right of diaphragm head 42 is connected to 38 andconsequently to the mg reservoir 37.

The graduated release control comprises a rotary valve cbntained invalve diaphragm- 19 withthe emergency reservoir 20 and chamber .44 atthelease, as shown in Fig. 1 flui chamber 46 and ahandle 47 foroperating said In operation, with the handle 47 of the release controlportion seat for raduatedre- V supplied to the brake pipe 48, flows trough passage 49 to piston chamber 4 of the triple valve device, andwith piston 3'in normal full release position, fluid flows from pistonchamber 4 through passa e 50 and a restricted port 51 and past a bacheck valve 52 to passage 53 and valve chamber 7, charging said valve 7chamber and the auxiliary reservoir 28,

through passage 27, with fluid at'the pres-' sure carried in the brakepipe 48.

V The maintaining reservoir 37 is also charged with fluid under pressurefrom passage 50,. past ball check valves '54 and 55,

56, pasage 57 having a restricted ow port 58, and passages 59 and 60,the passage 60 in communication with pastsage 38, leading to themaintaining reservoir 37. The maintaining reservoir is connected through61 with chamber 44 at the right of phragm head 42, so that the diaphragmhead 42 will be shifted to the left, causing a port, leading to thepassage 61, to be uncovered bythe movement of slide valve 40. Fluidunder pressure is th'en supplied to valve chamber 41 and through passage19 tothe emergency reservoir 20.

- When the emergency reservoir has been charged to substantially thepressure of the the diaphragm head 42 and slide valve to the right, soas to cut on communication from the maintaining reservoir to theemergency reservoir.

If it'is desired to eifect a service applica# tion of the brakes, agradual reduction in brake pipe is made and thereupon I the triple v vepiston 3 is moved out to serv ice position, in which port 63 in slidevalve 5, which was uncovered by the preliminary pressure, and the wellknown quick 86118-1.

action throughout the train.

ith the usual; dard fluid pressure brake, the design and roportions aresuch that the first five poun s reduction in brake va ve device so as'tosupply uid under pressure to the brakecylinder suflicient to efiect' Qthe movement of the brake cylinder piston maintaining reservoir 37, thespring 62 shifts movement of the graduatm valve 6, regisbrake cylinderpressure functions to 0 rate the triple to a predetermined distance,which is usually eight inches, and then for every additional poundreduction in brake pipe pressure, the

rake cylinder pressure is increased threeand one-quarter pounds.

The ressure maintaining portion is subject to the pressures of the brakecylinder, the auxiliary reservoir, and the constant pressure of theemergency reservoir and the diaphragm'heads 12, 13, and 14 are soproportioned that for every reduction in auxihary reservoir pressure ofone pound, which corresponds with a pound reduction in brake pipepressure, the maintainin portion operates to maintain a' pressure of tree and one-quarter pounds in the brake cylinder; In order to revent themaintaining portion fromraismg the brake cylinder pressure in the aboveproportion during the first five pounds reduction in brake pipepressure, so that the brake cylinder pressureon cars equipped with theimprovement will not be higher than on cars not so equipped, the diaphrahead 14 is subjected -to the pressure 0 a spring29, which is such thatthefirsttfive pounds reduction in auxiliary reservoir pressure isbalanced by the opposing pressure of the spring. V

' As the brake pipe pressure is reduced to a greater extent than fivepounds, the brake cylinder pressure is increased at the rate of threeand one-quarter pounds for each pound reduction in brake pipe pressureas hereinbefore explained and. so long as there is no leaks e from thebrake cylinder or the brake cylin er .piston does not exceed its normalpiston travel, the maintaining portion will not act.

If, however, there is leakage from the brake cylinder, or the brakecylinder pressureis not increased at the above rate, then r the balanceof pressureson the maintaining portion will be destroyed and themaintainmg portion will be operated by the corresponding deficiency ofbrake cylinder pressure ac'tin on the diaphragm head 13, so that theslidevalve 10 is moved to the right,

the movement of the diaphragm head '14 to the right, first operating tocompress the spring 29 and then moving to engage and move the springstop 30 so as to compress the spring 31. The slide valve 10 is. thusmoved, so that the notch 70 registers with passage 7 land fluid underpressure is then supplied from the maintaining reservoir 37 tothe brakecylinder 25 through passage 38, passage 60, valve chamber 46 of therelease controlling valve device, ort 72 in rotary valve 45, passage 71,note 70, valve chamber 11 ofthe maintaining valve portion and assage 23.When the bra e cylinder pressure has thus been increased by flow fromthe maintaining reservoir to the predetermined ratio, the increase inbrake cylinder pressure acting on pressure of the diaphra head 13,together withthe e P phragm heads and t e slide valve 10 to the eft tolap ltlOIl, in which further flow of fluid to the rake cylinder is cutoil. If, after thebrakes have been applied, it 1s deslred to effect agraduated release of the brakes, a gradual mcrease in-brake pipe pressure is made and the triple valve piston 3 is thereby shifted to normalrelease sition. In th1s position,fluid is supplied rom the brake plpe tothe auxiliary reservoir through passage 50, past check valve 52, andpassage 53- and the increase in auxiliary reservo'u' pressure as thusefi'ected, acts on the diaphragm head 14 of the maintaining portion soas to shift the slide valve 10 to the left to the release position, inwhich the brake cylinder is connected to the exhaust, through passages23, cavity 73 in triple slide valve 5, pas-- sage 74, cavity 75 inrotary valve 45, passage 76, cavity 77 in slide valve 10, and exhaustport 78. When the brake cylinder pressure as been reduced to correspondwith the increase in auxiliary reservoir pressure, the essures acting onthe diaphragm heads will such that the slide valve 10 will be moved tothe right to lap position, thus cutting off the; further exhaust offluid from the brake cyhnder. A further reduction in brake cylinderpressure may be effected in the same manner, by making a furtherincrease in brake pipe pressure, as will be evident.

If it is desired to cut out graduated release and release the brakesdirectly, the handle 47 of the release control portion is operated toturnthe rotary valve to the position shown in Fig. 2. In this position,the passage 74 is connected'through cavity 79 in rotary valve 45 with anatmospheric exhaust port 80, insteadof to passage 76, so that therelease of fluid from the brake cylinder is controlled dibv the triplevalve device and indepen ently of'the pressure maintaining portion. Withthe exhaust so controlled, when "the triple valve device is operated byan inbrakes, the fluid under ressure in the brake crease in brake pipepressure to release the cylinder will be comp etely exhausted, as

,would be the case in any fluid pressure brake equipment not having thegraduated release feature.

With direct exhaust from the brak cyli der, if the bmkes are applied andthere is brake cylinder leakage, so that the presure maintaining portionoperates to supply fluid from the maintaining reservoir to compensatefor -the loss by leakage, thepressure in the reservoir presd flow fromthe 50 and main degree less than the auxilia sure, in which case fluidwou auxiliary reservoir through passage 7 past the check valves 54 and55 to the maintaining reservoir. This reduction in auxiliary reservoirpressure cause the triple valve 31 act-to shift the diareservoir may bereduced to a P piston to move to release position, in which i the brakecylinder is connected to the direct tinue to attempt to maintain thebrake cylinder pressure, with the result that the maintainmg reservoiras well as the auxiliary reservoir and the brake pipe would be vented atthe exhaust rt 80. i

In order to o viate the above difliculty, the

ressure maintaining ortion is prevented rom operatlng when t e triplevalve device is in release position .and the release controllmg dev ce15 in-the direct release ositlon.

For this purpose, the passage 71 in irect release POSltlOlllS connectedthrough a cavity 81, in the rotary valve 45, with a passage 82, whichleads to the seat of the tri le slide valve 5. In service applicationposition of slide valve 5, the passa e 82 is connected through a cavity83in the s ide valve with passage 56, which communicates with themaintaining reservoir 37, so that in service position fluid underpressure is supplied from the maintaining reservoir -to the pressuremaintaining portion and consequently; the maintaining portion canoperate as usual. If,-however, the triple valve piston should move torelease position, then the passage 28 will be blanked and the pressuremaintaining portion will be prevented from operating.

, In the graduated release position, however, fluid under pressure issupplied" from the maintaining reservoir 37 directly from the valvechamber 46, through port 72 to the passage 71, so that in graduatedrelease position, the pressure maintaining portion can operateregardless of the position of the triple valve device.

When an emergency application of the brakes is effected, the triplevalve piston 3 is moved to its extreme outer position in which a passage84, leading to piston chamber 33 is connected through cavity 83 in slidevalve 5 with an exhaust port 85. Fluid under pressure is then ventedfrom piston chamber 33' merit of slide valve 5 to emergency positionalso uncovers a pasage 86, so that fluid under pressure from the valvechamber 7 and consequently the auxiliary reservoir 28, as well as theconnected emergency and maintaining reservoirs is supplied through saidand a restricted port 87 to a passage 88 which leads to brake cylinderpassage 23, the object being to provide a slow build up of brakecylinder pressure after an initial inshot, as efiected by apparatus,such as shown in Patent No. 1,585,774 of Clyde C. Farmer, issued May 25,1926, and which it is not deemed necessary "to explain in thepresent aplication.-

cans are also rovided for retarding the release of the bra es, wherebyupon an increase in brake pipe pressure for releasing the brakes, therelease of the brakes on the forward end of the train is retarded, bytemporarily restricting the brake cylinder ex- 1 aust,rso that as thewave of increased brake pipe pressure travel'sthrough the train andactuates the triple valves at the rearend of the train, asubstantiallysimultaneous release of all the brakes .will be effected.

For this'purpose, the triple valve device has two release positions, anormal full release position and a retarded releaseposition. The springpressed stop 8 yieldingly maintains the triple valve slide valve 5 innormal release position, as shown in Fig. 1, but when the brake pipepressure is increased to effect the release 1 jof the brakes, the rapidincrease of pressure at the head end of the train will move the piston 3and slide valve 5. to theextreme inncr retarded release position, inwhich a restricted extension 89 of release cavity 73 limits or restrictsthe rate at which fluid is released from the brake cylinder, the tripleonly to the full release position.

When the'triple valve device is in the full release position, "as shownin Fig.1, fluid,

supplied to the brake pipe 48, flows through passage49 to piston chamber4, andvfrom i thence flows through passage 50 and restricted port 51andpast ball check valve 52 to pas: sage 53 and valve chamber 7charging'sai'd valve chamber and the auxiliary reservoir 28, throughpassage 27, with fluid at the pressure carried in the brake pipe 48. v

However, when the triple valve device is in retarded release position,passage 53 is blanked by piston 3, so that the'communi'cation throughwhich the auxiliary reservoir'28 is recharged from the brake ipe 48 iscut 3, and the charging of the auxi iary reservoir is controlledentirely through passage 56, leading to the seat of the main slide valve5.

In retarded release position, therefore, the

: auxiliary reservoir 28 is first recharged with' fluid under pressure.from the maintaining reservoir 37, through passages 38, 60," 59, pastball check valve 101, passage'fifi, port 100 in the main slide valve 5,and past the end of the graduating valve 6, to valve chamber 7, charglngsaid chamber and the auxiliary reservoir A 28 in the manner hcreinbeforedescribed.

lVhen the pressure of the fluidin the main- "t'aining reservoir isreduced a predetermined amount and the brake pipe pressurebecomesgreaterthan the maintaining reservoir prescommunication which ise"the train.

sure which acts on the ball check valve 55 w initially hold said ballcheck valve seated,

fluid under pressure from the brake pipe'48 will flow through passage 50from the piston chamber 4 at a rate controlled by the flow topassage'56,and thence to the valve chamber port 51, and past ball check valves 54and 55,

ing recharged with fluid under pressure from the maintaining reservoir37, the fluid willby pass the passage 57 having the restricted flowport58, because ball check valve 101 permits unrestricted flow fromassage 59 to passage 56 around the restrictecf flow port 58 in passage57, which flow port is adapted to control the charging rate ofthemaintaining reservoir37 from the brake pipe 48. In this way, theconstruction provides means .whereb the auxiliary reservoir is chargedwithflui under pressure from the brake gape through one triple valvedevice is in full release position, and through anothercommunicationwhich is effective only when the triple valve device is inretarded release position. I

'With graduated release, when the brake valve device is moved fromrelease to lap position in the usual way, there'is a possiblllty, due tothe rush offluid from the head to the rear of the train, that the brakepipe ressure at the head end "ma to shift the triple va ve piston toapplication positionand with. the quick service feature resent, fluidmay then be vented the rake pipe to the quick action chamber 64 so as tocause a reapplicationof the brakes.

In order to prevent this, the retarded release movement of the'triplevalve parts is utilized, to restrict or entirely prevent the venting offluid from the quick action chamher when the triple valve parts are inthe retarded release Upon movement of the triple valve parts to fullrelease position, .fluid vented from.

the brake pipe to the chamber-64, is released by way of passage 65,cavity 66 in slide valve 5, passage 90, and restricted port 91 but inretarded release position,fluid is-released from thechamber 64 by way ofan additional passage 92 having a restricted port 94, which is morerestricted than the port 91, and'in fact, the passage 93 might in somecases be dispensed with or entirely plugged, so that in the retardedrelease position, fluid would not be vented from the chamber 64. I

With the above arrangement, if a graduated release is efiected, therelease of fluid from the chamber 64, which was vented thereto in makingthe previousbrake application, will only -bevented,ifat all, at a veryslow rate -at the head end of the train, when the triple valve moves toretarded release position, so

ective when the be reduced su ciently.

position at the head end of v i and an auxiliary reservoir, of a brinder pressure maintainin valve device com: prising avalve'for controlin the supply of and a brake pipe, of avvalve mechanism for v tion witha bra e pipe and brake cylinder,

iary reservoir 28 instead of from the maintaining reservoir 37, and forthis purpose a changeover cap is provided which in one position, asshown inFig. 1, connects passage 38 through a cavity 96 with passage.61, so

that the source of supply for the charging device is the maintainingreservoir 37. In the other position of the cap 95, as shown in Fig. 3,passage 61 is connected, through a cavity 97, with passage 36, so thatthe auxiliary reservoir 28 is then connected to the charging device. 1

Having now described the invention, what is claimed as new and desiredto be secured by Letters Patent, is:

' 1. The combination with a brake cylinder and an auxiliary reservoir,of a brake cylinder pressure maintaining valve means operated. accordingto variations in pressure in the auxiliary reservoir and the brakecylinder for controlling the supply of fluid under pressure to the brakecylinder.

2. The combination with abrake cylinder and an auxiliary-reservoir, of abrake cylinder pressure maintaining valve means operated according tovariations in pressure in the auxiliary reservoir and the brake cylinderfor controlling the sup ly and exhaust of fluid under pressure to anfrom the brake cylinder.

- 3: The

e cylinder pressure maintaining valve device comprising a valve forcontrollin the sup ly of fluid under ressure to the bra e cylinder, andmovable agutments subject to variations in pressure iii the brakecylinder and the auxiliary reservoir for operating said valve.

' 4. The combinationwith a brake c linder e -cylfluid under pressure tothe rake cylinder, and movable abutments subject to variations inpressure in the brake cylinder and the aux iliary reservoir, and to .aconstant pressure for operating said valve.

5. Thecombination with a' brake cylinder 6. The combination with a brakecylindercombination with a brake c linder and an auxiliary reservoir, ofa br 40v and a brake pipe, ofa valve mechanism for controlling the 4brakes and the maintaining of brake cylinder aduated release, of thepressure against leakage, a valve device operated upon a reductioninbrake pipe pressure for suppl ing fluid to the brake cylinder,

a. valve opera Is to prevent the functioning of said valve mechanism tograduate the release of the brakes and also to prevent the functioningof said valve mechanism to maintam the brake cylinder ressure except u n4 evice to the brake cylinder. V

7. The combination with a brake cylinder and brake pipe, of a source offluid under gressure, a valve device operated 'upon a reuction 1n brakepipe pressure for supplying fluid under pressure to the brake cylinder,a valve'mechanism operati upon a deficien in brake c linder pressuriiorsupply' fluid from sai source' to the brake cyli lider, a manually orable valve having a position for establis ing communication from saidsource to said valve mechanism and another position in which said sourceis connected to said valve mechanism through passages controlled by saidvalve device.

8. The combination with a brake c linder and brake pi e, of a sourceofflui under pressure, a va' ve .device operated upon a removement of saidvalve supply uid duction 1n brake pipe pressure for supplying fluidunder pressure to the brake cyhnder, a valve-mechanism o'peratin upon adeficiency in brake cylinder pressure or supplying fluid from saidsource to the brake cylin manually operable valve having a positionforestablishing communication from said source .to said valve. mechanismand another I ing two. release positions, a chamber into which fluid isvented from the brake pip: upon movement of said device to apply brakes,fluid being released from ear her at one rate upon movement of saidvalve I device to one release position and at a difler-.

ent rate upon movement of said valve devi to the other release position.10. In a fluid ressure brake, the combina- III of avalve device operatedby variations m brake pipe pressure for contro mission and exhaust offluid under to and from the brake cylinder, a vinto which fluid underpressure is vented frqln the brakes to of the brake pipe in app fect.quick service action, said valve device having two release position, inone of which lling the adfluid is vented from said chamber at apredetermined rate and in theother at a lesser rate.

11. In a fluid pressure brake, the combination with a brake pipe andbrake cylinder, of a'valve deviceoperated by variations in brake pipepressure for controlling the admission and exhaust of fluid underpressure to and from the brake cylinder, a chamber into which fluidunder pressure is vented from the brake pipe in applying the brakes toefl'ect quick service action, said valve device having a normal'releaseposition and an inner release position in which the release of fluidfrom the brake cylinder is restricted and-adapted in the normal releaseposition to vent fluid from said chamber at a redetermined rate and in.the' restricted re ease position at a lesser rate.

p 12. A fluid pressure brake ap aratus comprising a brake pipe, brakecylin er, alixiliary reservoir, maintaining reservoir, two check.

valves, a triple valvedevice operated upon a reduction in brake pipepressure for supplying fluid under pressure from the auxiliary reservoirto the brake cylinder, a maintaining valve device for supplying fluidunder pressure from the maintaining reservoir to the brake cylinder,said maintaining reservoir bein charged with fluid under pressure fromthe brake pipe-through a port open only when the triple valve device isin release position and past said check valves.

13. A fluid pressure brake apparatus comprising a brake pipe, brakecylinder, auxiliar reservoir, maintaining reservoir, two checli valves,a triplevalve device operated upon a reduction in brake pipe pressureforsupplying fluid under pressure from the auxillary reservoir to the brakecylinder, a maintainlng valve device for supplying fluid under pressurefrom the maintaining reservoir to the brake cylinder, said maintainingreservoir being charged with fluid under pressure from the brake pipethrough a passage controlled by the triple valve piston .and past saidcheck valves.

.said check va'lvesand through a restricted port.

15. A fluid ressure brake apparatus comprising a bra e pipe, brakecylinder, aux-- iliary reservoir, maintaining reservoir, two

check valves, a triple valve device operated upon a reduction in brakepipe pressure for supplying fluid under pressure from the. auxiliaryreservoir to the brake cylinder, a maintaimng valve device for supplyingfluid under pressure from the maintaining reservoir to the brakecylinder, said maintaining reservoir being charged withvfluid underpressure from the brake pipe through a port open to the brake pipe inrelease position of the triple valve device and past the check valves,

said port being open to the auxiliary reser-- voir side of the triplevalve -device upon movement of same to a plv the brakes.

- 16. A fluid pressure Eralre apparatus comprisinga brake pipe, brakecylinder, auxiliary reservoir, maintaining reservoir, an emergencyreservoir, a triple valve device operated upon, a reduction in brakepipe pressure for supplying fluid under pressure from the auxiliaryreservoir to the brake cylinder,

a maintaining valve device subject to emergency reservoir pressure forsupplying fluid under pressure from the maintaining reservoir to'thebrake cylinder, and a charging valve device operated by fluid underpressure from t-he maintaining reservoir for control-. ling the'supplyof fluid under pressure from the maintaining reservoir to the emergencyreservoir. r v i 17 A fluid pressure brake apparatus comprising a brakepipe, brake cylinder, auxiliary reservolr, maintaining I'eSBIV01I',, an

emergency reservoir, a triple valve device operated upon a reductioninbrake pipe pressure for supplying fluid under pressure from theauxiliary reservoir to the brake cylinder, a maintaining valve devicesubject to emergency reservoir pressure for supplying fluid underpressure from the maintaining reservoir to the brake cylinder, means forcharging the maintaining reservoir'from the brake pipe, and means forcharging the emergency reservoir from the maintaining reservoir.

18. A fluid pressure brake apparatus com-- prising a brake pipe, bralrecylinder, auxil iary reservoir, malntalnlng reservo r, an emergencyreservoir, a triple valve device operated upon a reduction in brake pipepressure 'for supplying fluid under pressure from the auxiliaryreservoir to the brake cylinder, a maintainingv valve device subject toemergency reservoir pressure for supplying fluid under pressure from themaintaining reservoir to the brake cylinder, means for charging themaintaining reservoir from the brake pipe, and acharglng valve deviceoperated by fluid under pressure from the mainta1ning reservoir forcontrolling the,

supply of fluid under-pressure from the malntaming reservoir totheemergency res--v ervoir.

19. A fluid pressure brake apparatus comd prising a brake pipe,brakecylinder, auxilgency ap lication of the brakes.

20. A uid pressure brake apparatus comprising a brake pipe, brakecylinder, auxilnary reservoir, 7 maintaining. reservoir, an v reservoir,a. triple valve device operated upon a reduction in brake pipe pressurefor supplying fluid under pressure from the auxiliary reservoir to thebrake cylinder,

a valve device subject to emer-' I gency reservoir ressure for supplyingfluid under presure m the maintaining reservoir to the brake cylinder,and a valve device operated upon movement of the triple valve devicetoeflect an emergency application of the brakes for connecting themaintaining ac reservoir and the emergency reservoir to the auxiliaryreservoir, so that 'flu'id from the three reservoirs is supplied to thebrake cylinder in an emergency application of the brakes. al 21. In afluid ressure brake, thefcombination with a b e pipeand a tri 1e valvedevice having means for venting t e brake" pipe in service applicationposition, of means operating upon an excessive rise 1n brake n p1pe p inreleasing the brakes for preventing or reducing the venting of the brakepipe in an ensuing service application of the 22. In a fluid pressurebrake, the combina 5 tion with a brake pipe and a triple valve device hameans for venting the brake pipe service application position, of meansopera ipe 33min releasing the brakesfor re- II the venting of the brakepipe in anenslnnfiservice application of the brakes a fluid ressurebrake, the combina-v tion with a b e-pipe, auxiliary reservoir, and avalve device operated. upon a reduction I in brake for efl'ecting anappli-- cation es, of an additional reservoir and means operative in oneposition of said valvedevicefor supplying uid. under presume from thebrake pipe to the auxiharv Ii reservoir through a passage throu h whichfluid under presume is supplied mm the brake 'pe to said additionalreservoir.

24. a fluid presure brake,.the combinationwith" a brake pipe, auxiliaryreser- II voir, and a valve device operated upon a reupon an 'excesslverise in brake duction in brake pipe pressure for eflectin an applicationof the brakes, of an 'additi'ona reservoir and means operative. in oneosiunder pressure fromthe brake pipe to the auxiliary reservoir onlythrough a passage,

through which fluid under pressure is supplied from the brake pipe tosaid additional reservoir. I

25. In a fluid ressure brake, the combination with a bra e pipe,auxiliary reservoir, and a valve device subject to the opposing ressuresof the auxiliary reservoir and the rake pipe and operated u on areduction in brake i e ressure for e ecting an application of tiiegrakes, of an additional reservoir. and means operative in a releasesition of said valve device for sup lying uid under tion of said valvedevice for supplying uid I pressure from the brake pipe through apasthrough a passage which is open to the brake pipe only in theretarded release position of said valve device and from saifl passage tothe auxiliary reservoir.

27. In a fluid lpressure brake, the combination with a bra e piauxiliary reservoir, and a valve device su ject to the opposingpressures of the auxiliary reservoir and the brake pipe and operated uon a reduction in brake iple pressure for e ectin an application 0 t ebrakes, said valve evice aving -'a"full release and a retarded releaseposition,

of an additional reservoir and means for su plying fluid under pressurefrom the bra e pipe to the auxiliary reservoir through a assage which isopen to the brake pi only mthe full release position of said vs vsdevice and for. supplying fluid under pressure from the brake pipe tothe additional reservoir through a passage which is o n to, the brakeipe onl in the retarded re ease posle tion of said valve device and fromsaid last named passage to the auxiliary reservoir.

28. In a flu d ressure brake,the combination with ,a bra e pipe,auxiliary reservoir, and a valve device comprising a pistousubject tothe op 'ng pressures of the auxili'a reservoir and the brake pipe and amain sli' valve and a graduating valve 0 rated by said piston upon areduction in device for suppl ing fluid 'under pressure sage to theauxiliary reservoir'throug a cominunicatlon controlled by said valves.

tion with a brake pipe, auxiliary reservoir,

' and a valvedevice comprising a. piston subv device for supplying Ifrom the brake pipe to the auxiliary reservolr ject to the opposingpressures of the auxiliary reservoir and the brake pipe and a main slidevalve and a graduating valve 0 erated by said piston upon a reduction'inbra e pipe pressure for effecting an application of the rakes, saidvalve device having a full re-.

lease position and a retarded release position, of an additionalreservoir and means operative invthe full release osition of said valveuid under pressure.

and operative only in the retarded release position of said valve devicefor supplying fluid under pressure from the brake pipe to saidadditional reservoir through a passage and from said passage to theauxiliary reservoir through a port controlled by said valves.

30. In a fluid pressure brake, the combination with a brake pipe,auxiliary reservoir, brake cylinder, and a valve device c0mprising apiston subject to the opposing pressures or the auxiliary reservoir andthe brake pipe, a main slide valve, and an auxiliary valve operated bysaid piston upon a reduc- 7 tion in brake pipe pressure for effectingthe supply of fluid under pressure to the brake cylinder, of i anadditional reservoir and means operative upon movement of said valvedevice to a release position for sup lying ently of said auxiliaryvalve.

fluid under pressure from said additional reservoir to the auxiliaryreservoir through a communication controlled by said valves, the exhaustof fluid from the brake cylinder being. controlled by said main valveindepend- 31. In a fluid pressure brake, the combination with a brakepipe, auxiliary reservoir, brake cylinder, and a valve device comprisinga piston subject to the opposing pressures of the brake pipe andauxiliary reservoir, a main slide valve, and an auxiliary valve operatedby said piston, of an additional reservoir normally charged with fluidunder pressure, said valve device having a port controlled joint'lybysaid main valve and said auxiliary valve through which fluid underpressure is vented from said additional reservoir to the auxiliaryreservoir in release position of said valve device, the exhaust of fluidfrom the brake cylinder being controlled by said main valveindependently of said auxiliary valve.

32. In a fluid pressure brake, the combinapipe and operated upon areduction in brake release and a retarded release position, of

means for supplying fluid under ressure to the auxiliary reservoir-fromthe rake pipe 29. In a fluid pressure brake, the combina- -which isestablished when said valve device is in the retarded release position.

33. In a fluid ressure brake, the combinw tion with a bra e pipe,auxiliary reservoir, and a valve device operated upon a reduction inbrake pipe pressure for eifecting an application of the brakes, saidvalve device having a full release position and a retarded releaseposition, of aneadditional reservoir, means by which both 'of saidreservoirs are charged with fluid under pressure from the brake pipethrough a passage which is open when said valve device is in the fullrelease position, and means by which the auxiliary reservoir ischargedwith fluid under pressure from the additional reservoir and from thebrake pipe, when the valve device is in retarded release position.

device, and means for supplying fluid under 34. In a fluid pressurebrake, the combine:

tion with a brake pipe, auxiliary reservoir, and an additionalreservoir, of a valve device operated upon a' reduction in brake pipepressure for effecting an application of the brakes, said valve devicehaving a full release position in which communication is establishedthrough which the auxiliary reservoir and the additional reservoir arechar ed with fluid under pressure from the bra pipe, and a. retardedrelease osition in which the first communication is lanked and a secondcommunication is established through which the auxiliary reservoir ischarged with fluid under pressure flOlIl'tllB additional reservoir andthe brake pipe.

35. In a fluid ressure brake, the combination with a. bra e pipe,auxiliary reservoir,

and a valve device subject to the opposing pressures of the auxiliaryreservoir and the rake pipe and operated upon a reduction in brake pi epressure for efiecting an application ot the brakes, said valve devicehaving two release positions, of an additional reservoir and means forsupplyin fluid under pressure from the brake 1pc to t e auxiliaryreservoir, said means inc uding a check valve subject to the brake pipe.pressure only in one release-position of said valve device and 1 anothercheck valve subject to the brake pipe pressure only'in the other releaseposition I of said valve device.

CLYDE o. FARMER. a. MABLE M. THOMAS, Exeoutm'w of the Last and Testamentof Thomas H. Thomas, Deceased.

